Microstructure and mechanical properties of rheo-squeeze casting AZ91-Ca magnesium alloy prepared by gas bubbling process

Zhang, Yang; Wu, Guohua; Liu, Wencaı; Zhang, Liang; Pang, Song; Ding, Wei

doi:10.1016/j.matdes.2014.10.087

Cited by 32 publications

(9 citation statements)

References 29 publications

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“…Gas and shrinkage porosity can be effectively eliminated by squeeze casting technology, which has been recommended to manufacture the complex component from aluminum alloys and aluminum metal–matrix composites [ 12 , 13 , 14 ]. The semisolid squeeze casting (SSSC) process, which combines the excellent filling performance of a semisolid metal with the characteristics of squeeze casting technology [ 15 , 16 ], is one of the most widely used semisolid metal-forming (SSMF) techniques. It integrates the easy fluidity of the liquid casting process and the high mechanical properties of solid-state plastic forming and is considered one of the most promising metal processing technologies of the 21st century [ 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Optimization of the Semisolid Multicavity Squeeze Casting Process for Wrought Aluminum Alloy Scroll

2020

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Scroll compressors are popularly applied in air-conditioning systems. The conventional fabrication process causes gas and shrinkage porosity in the scroll. In this paper, the electromagnetic stirring (EMS)-based semisolid multicavity squeeze casting (SMSC) process is proposed for effectively manufacturing wrought aluminum alloy scrolls. Insulation temperature, squeeze pressure, and the treatment of the micromorphology and mechanical properties of the scroll were investigated experimentally. It was found that reducing the insulation temperature can decrease the grain size, increase the shape factor, and improve mechanical properties. The minimum grain size was found as 111 ± 3 μm at the insulation temperature of 595 °C. The maximum tensile strength, yield strength, and hardness were observed as 386 ± 8 MPa, 228 ± 5 MPa, and 117 ± 5 HV, respectively, at the squeeze pressure of 100 MPa. The tensile strength and hardness of the scroll could be improved, and the elongation was reduced by the T6 heat treatment. The optimal process parameters are recommended at an insulation temperature in the range of 595–600 °C and a squeeze pressure of 100 MPa. Under the optimal process parameters, scroll casting was completely filled, and there was no obvious shrinkage defect observed inside. Its microstructure is composed of fine and spherical grains.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Optimization of the Semisolid Multicavity Squeeze Casting Process for Wrought Aluminum Alloy Scroll

2020

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“…is required to enhance the nucleation rate and restrict the growth of primary particles and consequently lead to the formation of slurries with uniform and refined microstructure [9]. Among above fields, while the twin screw shearing [10], gas bubble stirring [11,12] and ultra-sonic vibration [13] are able to produce fine and spherical primary particles, they tend to introduce slags and oxidized films (in particular, Mg melt is highly active and prone to be oxidized [14]) into the melt, which would cause the premature fracture of alloy. On the other hand, electro-magnetic stirring, which would not cause oxidation and subsequent contamination of the melts, appears to be suitable to be used to prepare slurries of Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

“…T. Campanella and M. Rappaz et al proposed a dendrite fragmentation criterion to study the grain refinement effect by electromagnetic stirring treatment, and proved this theory by experimental study on two kinds of Cu alloys [19]. In addition, previous researches were mainly toward Al alloys and Mg-Al based alloys [10,12,13,[20][21][22], while very little work has been carried out toward the Mg-RE based alloys.…”

Section: Introductionmentioning

confidence: 99%

Preparation of an Mg–Gd–Zn alloy semisolid slurry by low frequency electro-magnetic stirring

et al. 2015

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“…In all magnesium alloy, Mg-Al series alloy exhibits excellent corrosion resistance due to the high percentage of Al. In the as-cast Mg-Al series alloys, the addition of minor Ca is believed to be a beneficial method to improve their corrosion resistance and mechanical properties [6][7][8]. When the alloy element Ca is used to modify the corrosion properties, microstructure changes are inevitable.…”

Section: Introductionmentioning

confidence: 99%

The Corrosion Behaviours of AZ61 Magnesium Alloy with the Ca Addition

Chen¹,

Li²,

Zhang³

et al. 2015

Proceedings of the 2015 Asia-Pacific Energy Equipment Engineering Research Conference

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the corrosion behaviors of AZ61 magnesium alloy with the Ca addition have been studied in this paper. These alloys were prepared in an induction melting furnace with an Al 2 O 3 crucible under a mixed atmosphere of CO 2 and SF 6. The corrosion tests were completed using immersing in 0.5% and 3.5% NaCl solution for 4 hours at room temperature with no stirring. The phase analysis was performed by XRD. Olympus optical was used to characterize the microstructure and phases of magnesium alloys. Scanning electron microscopy was used to exhibits the morphologies of corroded surfaces of magnesium alloys after removal of the corrosion products. The results exhibited that with the addition of alloy element Ca, the microstructure of AZ61 magnesium alloy was remarkably refined, and the spotted, high-melting point phase Al-Ca intermetallic compounds can be found. With the addition of different content Ca, the corrosion behavior of AZ61 alloy decreases firstly and then increases sharply. When the content of Ca is 1%, AZ61 magnesium alloy shows the lowest corrosion rate. And the corrosion rate of AZ61-1% Ca alloy is 2.19 and 2.87 mm/a at 0.5% and 3.5% NaCl solution respectively.

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Microstructure and mechanical properties of rheo-squeeze casting AZ91-Ca magnesium alloy prepared by gas bubbling process

Cited by 32 publications

References 29 publications

Experimental Investigation and Optimization of the Semisolid Multicavity Squeeze Casting Process for Wrought Aluminum Alloy Scroll

Experimental Investigation and Optimization of the Semisolid Multicavity Squeeze Casting Process for Wrought Aluminum Alloy Scroll

Preparation of an Mg–Gd–Zn alloy semisolid slurry by low frequency electro-magnetic stirring

The Corrosion Behaviours of AZ61 Magnesium Alloy with the Ca Addition

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